18351885001 has 2 divisors, whose sum is σ = 18351885002. Its totient is φ = 18351885000.

The previous prime is 18351884981. The next prime is 18351885007. The reversal of 18351885001 is 10058815381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17881038400 + 470846601 = 133720^2 + 21699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18351885001 is a prime.

It is not a weakly prime, because it can be changed into another prime (18351885007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9175942500 + 9175942501.

It is an arithmetic number, because the mean of its divisors is an integer number (9175942501).

Almost surely, 2^18351885001 is an apocalyptic number.

It is an amenable number.

18351885001 is a deficient number, since it is larger than the sum of its proper divisors (1).

18351885001 is an equidigital number, since it uses as much as digits as its factorization.

18351885001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 40.

The spelling of 18351885001 in words is "eighteen billion, three hundred fifty-one million, eight hundred eighty-five thousand, one".